Need ability to load file with "complex" Master/Detail structure

[redflowIT]

I have a file with a structure like this:
HEADER
RECORD TYPE1
RECORD TYPE2
RECORD TYPE3
RECORD TYPE3
RECORD TYPE1
RECORD TYPE2
RECORD TYPE4
RECORD TYPE5
TAIL
....
in which there are many groups that starts with HEADER and ends with TAIL
This is an example
Test.txt

and those are specs: CBI-RND-001 6_05_ENG.pdf

I could use the Read from stream With multiple fixed record types but when I get the list of RECORD TYPEx I don't know in which group the record was readed.
Is it possible at least to have the line number of each records?

Thank you
Regards